What? Reality was breaking down, we never saw how she was restored. If Morrison wants to pull that kind of crap then I say reality was rewritten so she never actually got corrupted.
That's why that scene at the end showed her looking at the mask and slowly destorying it, instead of just smashing it really bad(which I think she has enough temper for.) It was a remnant of a possible reality that she felt somehow had some connection to her. Then she looked at it, decided no, it doesn't and wasn't worth keeping.